Malicious PDF — malware analysis report

Static analysis result for SHA-256 82183732ba75d0ae…

MALICIOUS

PDF

72.6 KB Created: 2021-01-19 10:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a74243ac3e916375f08bcd4134010251 SHA-1: 21555f37618a5a8fd28f5dd843a30419efa5239b SHA-256: 82183732ba75d0aed4a79c723289756187162ab95727c14dd4aaaa2b6f697f20
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/123?utm_term=the+house+with+a+clock+in+its+walls+book PDF link annotation
    • https://cdn.sqhk.co/bidelefo/5L42vuM/speedometer_app_iphone_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5f8df114a1006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483589/normal_5fc46a6731806.pdfIn PDF document text
    • https://site-1168170.mozfiles.com/files/1168170/vikin.pdfIn PDF document text
    • https://cdn.sqhk.co/vibifexode/fLjfFih/36858023065.pdfIn PDF document text
    • https://zetizisoxaw.weebly.com/uploads/1/3/4/4/134498522/wejarigivabakixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f9c9d47eb007.pdfIn PDF document text
    • https://gamorajemusuro.weebly.com/uploads/1/3/4/3/134316050/samesuzebite.pdfIn PDF document text
    • https://site-1175878.mozfiles.com/files/1175878/74802734110.pdfIn PDF document text
    • https://site-1231171.mozfiles.com/files/1231171/business_model_canvas_ppt.pdfIn PDF document text
    • https://site-1180550.mozfiles.com/files/1180550/sawose.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/3ba8ad9bc09a.pdfIn PDF document text
    • https://site-1184666.mozfiles.com/files/1184666/16796004415.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/ykijrIc/86243901721.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/aigiaRF/dune_book_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 5036 bytes
SHA-256: 9e4e8bb7d31e4f6e009520551d2cde739fbe5de43bcaab0981382e394329155a
font_01_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 10604 bytes
SHA-256: 5d77ee3958190a3bcc920f1a697800053f7fda7f610cb73bbc61c41bad320bfa

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